I'm the Heroic Knight of an Intergalactic Empire! novel volume 3 was written by Yomu Mishima with illustrations by Nadare Takamine, and is a spin-off of I'm the Evil Lord of an Intergalactic Empire! series.

Starting her new mission aboard the Melea, aspiring knight of justice Emma crosses paths with former classmate Russell. He's an elite knight now, and his jabs at the Melea—and at her—could turn idealistic Emma into a nervous wreck. When top knight Marie takes a shot at training Emma personally, it's a chance for the young knight to prove her former classmate's trash talk wrong. But how badly did Russell rattle Emma? Can this B-rank knight still buckle down and bring her A game?!